| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // Copyright 2004-2005 Simtec Electronics |
| // Ben Dooks <ben@simtec.co.uk> |
| // |
| // http://www.simtec.co.uk/products/EB2410ITX/ |
| // |
| // Simtec BAST and Thorcom VR1000 USB port support functions |
| |
| #define DEBUG |
| |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/interrupt.h> |
| #include <linux/list.h> |
| #include <linux/gpio.h> |
| #include <linux/timer.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/io.h> |
| |
| #include <asm/mach/arch.h> |
| #include <asm/mach/map.h> |
| #include <asm/mach/irq.h> |
| |
| #include <mach/hardware.h> |
| #include <mach/gpio-samsung.h> |
| #include <asm/irq.h> |
| |
| #include <linux/platform_data/usb-ohci-s3c2410.h> |
| #include <plat/devs.h> |
| |
| #include "bast.h" |
| #include "simtec.h" |
| |
| /* control power and monitor over-current events on various Simtec |
| * designed boards. |
| */ |
| |
| static unsigned int power_state[2]; |
| |
| static void |
| usb_simtec_powercontrol(int port, int to) |
| { |
| pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to); |
| |
| power_state[port] = to; |
| |
| if (power_state[0] && power_state[1]) |
| gpio_set_value(S3C2410_GPB(4), 0); |
| else |
| gpio_set_value(S3C2410_GPB(4), 1); |
| } |
| |
| static irqreturn_t |
| usb_simtec_ocirq(int irq, void *pw) |
| { |
| struct s3c2410_hcd_info *info = pw; |
| |
| if (gpio_get_value(S3C2410_GPG(10)) == 0) { |
| pr_debug("usb_simtec: over-current irq (oc detected)\n"); |
| s3c2410_usb_report_oc(info, 3); |
| } else { |
| pr_debug("usb_simtec: over-current irq (oc cleared)\n"); |
| s3c2410_usb_report_oc(info, 0); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on) |
| { |
| int ret; |
| |
| if (on) { |
| ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq, |
| IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
| "USB Over-current", info); |
| if (ret != 0) { |
| printk(KERN_ERR "failed to request usb oc irq\n"); |
| } |
| } else { |
| free_irq(BAST_IRQ_USBOC, info); |
| } |
| } |
| |
| static struct s3c2410_hcd_info usb_simtec_info __initdata = { |
| .port[0] = { |
| .flags = S3C_HCDFLG_USED |
| }, |
| .port[1] = { |
| .flags = S3C_HCDFLG_USED |
| }, |
| |
| .power_control = usb_simtec_powercontrol, |
| .enable_oc = usb_simtec_enableoc, |
| }; |
| |
| |
| int __init usb_simtec_init(void) |
| { |
| int ret; |
| |
| printk("USB Power Control, Copyright 2004 Simtec Electronics\n"); |
| |
| ret = gpio_request(S3C2410_GPB(4), "USB power control"); |
| if (ret < 0) { |
| pr_err("%s: failed to get GPB4\n", __func__); |
| return ret; |
| } |
| |
| ret = gpio_request(S3C2410_GPG(10), "USB overcurrent"); |
| if (ret < 0) { |
| pr_err("%s: failed to get GPG10\n", __func__); |
| gpio_free(S3C2410_GPB(4)); |
| return ret; |
| } |
| |
| /* turn power on */ |
| gpio_direction_output(S3C2410_GPB(4), 1); |
| gpio_direction_input(S3C2410_GPG(10)); |
| |
| s3c_ohci_set_platdata(&usb_simtec_info); |
| return 0; |
| } |